Fix errors if promoted units change attack range

While in combat, if units are promoted and the promotion results
in a change in their attack range, this could trigger some errors
as 'this.template[type]' had a chance to be undefined when performing
a 'RepeatRangeCheck'.

Fixes #8670

binaries/data/mods/public/simulation/components/Attack.js

@@ -451,7 +451,7 @@ Attack.prototype.GetSplashData = function(type)
 
 Attack.prototype.GetRange = function(type)
 {
-	if (!type)
+	if (!type || !this.template[type])
 		return this.GetFullAttackRange();
 
 	let max = +this.template[type].MaxRange;